PHOTO: Travis Barker Teaches Rihanna to Beat the Drum

Drummer Travis Barker has been giving Rihanna private music lessons – and she's a great student, he says.

"Teaching Rihanna some things on drums," the blink-182 drummer tweeted on Tuesday, along with a photo of the pair at a rehearsal space in L.A. "She JAMS!!!!! Watch out for her!!"

While Rihanna can be seen behind a drum kit in the video for her latest single "Rude Boy," a source says she really wanted a pro like Barker to teach her how to play so she can perform live on her upcoming European and U.K. tour.